HiThanks for using FixYa. Error F4 in your fisher
& Paykel dishwasher occurs when no temperature increase has been detected
for 2hrs while the unit heating element is turned on. The issue seems to be
with a bad element, bad wiring harness and/or the control board itself has gone
bad. To start with you’ll have to check the element, temperature sensor and if
they appear fine then check the electronic control as this is responsible for
supplying the power to the element. Please do accept the solution if the issue
is resolved or post a comment for further assistance.ThanksRylee

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That
fault code is to do with the drain pump either its jammed or not
working remove the front plate at the bottom of the machine undue the
filter and check to see if it is either a blockage or something jammed
in the pump.

F3 alarm in F&P DD601 is linked to water temperature. If you are using cold water supply connection, then it is likely the heater unit or temperature sensor has gone faulty. If you are using hot water supply direct then the inlet water temperature is exceeding recommended range of approx 65deg C. DD601 is a fairly old unit and not sure if you can still get some parts.

I suggest pressing the keylock and power button together, hold for 5 secs, the display will change orange, the display should read HP if it says LP, press the start button to make display read HP.Then press power button to store. You will need to manually removed the water from the machine before restarting

I have a fisher paykel dd603 dishwasher. If I select the normal wash setting on the top drawer, it posts the time in the lcd screen as 56 mins. The unit will wash as usual until it reaches the 28 min mark. At this point it will stay on 28 mins and continue to run, but it won't rinse or empty the drawer of water. Also it never counts down below the 28 min mark. It has flashed a F4 and F1 code. I've cleared them both, and checked to make sure that no water is standing on the bottom of the unit, and that the heating element is working. I should mention that the top drawer did overflow about two weeks ago, and that I did clean up the water. I don't know where to look from here. Any suggestions?